This 3-Pin CPU Fan Speed Controller for PC is suitable for PC CPU fan with 3 pins.There is a speed knob to adjust the fan speed. CPU Fan Speed Controller has no adverse effect on the CPU and syetem. Features: RPM Alert Control voltage from 5V to 12V Channel supports up to 12W Manually adjust from full speed to low speed Suitable for other high RPM fansStop working alarm Input Voltage: 12V Output Voltage: 5-12V Output Current: Up to 1000mA Optimal Wattage: 12W Connection : 3pin terminal Size Approx:6.2 x 2.5 x 1.9 cm Color : Black Package Content : 1 X 3-Pin CPU Fan Speed Controller 1 X Double Sided Tape (Note : Photo attached is for reference only， it may be slightly varied in items of colour， shape from the actual item delivered from time to time)